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Published on: March 7, 2014
Patterned Au/poly(dimethylsiloxane) substrate fabricated by chemical plating coupled with electrochemical etching for
Hai-Jing Bai1, Min-Ling Shao, Hong-Lei Gou
1Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Summary
This study introduces a low-cost method for creating patterned gold on poly(dimethylsiloxane) (PDMS) substrates using chemical plating and electrochemical etching. This novel technique enables versatile surface patterning for biosensing applications.
Area of Science:
- Materials Science
- Surface Chemistry
- Biotechnology
Background:
- Conventional methods for creating patterned gold on poly(dimethylsiloxane) (PDMS) substrates, such as evaporation or sputtering, are often costly and complex.
- Developing cost-effective and simple techniques for fabricating patterned Au/PDMS substrates is crucial for advancing biosensing technologies.
Purpose of the Study:
- To present a novel, low-cost, and simple approach for preparing patterned gold on poly(dimethylsiloxane) (PDMS) substrates.
- To demonstrate the fabrication of heterogeneous Au/PDMS substrates with distinct gold "island" or PDMS dot patterns.
- To explore the utility of these patterned substrates for protein and cell patterning, creating cytophobic and cytophilic regions.
Main Methods:
- Chemical gold plating was employed to achieve a homogeneous gold layer on native PDMS, avoiding conventional evaporation or sputtering.
- Electrochemical etching, utilizing an oxidation reaction and chloride coordination, was used to pattern the gold layer.
- Hydrogen bubble generation during electrolysis was leveraged to create protected regions for gold "island" pattern formation.
- A poly(dimethylsiloxane) (PDMS) stencil with a hole array facilitated the etching of exposed gold regions, resulting in PDMS dot patterns.
Main Results:
- A novel, cost-effective method for creating homogeneous gold layers on PDMS was successfully developed.
- Heterogeneous Au/PDMS substrates with controllable "island" or dot patterns were fabricated using electrochemical etching.
- The patterned substrates effectively supported selective protein and cell patterning through surface modification, enabling the creation of distinct cytophilic and cytophobic areas.
Conclusions:
- The developed chemical plating and electrochemical etching method offers a versatile and accessible platform for fabricating patterned Au/PDMS substrates.
- These patterned substrates are suitable for creating controlled cellular microenvironments and hold significant potential for the development of advanced biosensing arrays.
- The technique provides a convenient approach for constructing substrates with both cytophobic and cytophilic regions for diverse biological applications.
